fix: can't do structured FTS in python (#2300)

missed to support it in `search()` API and there were some pydantic
errors

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Enhanced full-text search capabilities by incorporating additional
parameters, enabling more flexible query definitions.
- Extended table search functionality to support full-text queries
alongside existing search types.

- **Tests**
- Introduced new tests that validate both structured and conditional
full-text search behaviors.
- Expanded test coverage for various query types, including MatchQuery,
BoostQuery, MultiMatchQuery, and PhraseQuery.

- **Bug Fixes**
- Fixed a logic issue in query processing to ensure correct handling of
full-text search queries.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Signed-off-by: BubbleCal <bubble-cal@outlook.com>

python/src/query.rs

@@ -279,7 +279,7 @@ impl Query {
                 }
             }
             query
-        } else if let Ok(query) = query.downcast::<PyDict>() {
+        } else if let Ok(query) = fts_query.downcast::<PyDict>() {
             let query = parse_fts_query(query)?;
             FullTextSearchQuery::new_query(query)
         } else {